Extract of Relevant ITU "Draft Illegal" Rules

b.) Draft-Illegal Races:(i) Drafting from another athlete or motor vehicle is forbidden. Athletes must reject attempts by others to draft;

An athlete is entitled to any position on the course, provided they get to that position first and without contacting others. When taking a position, an athlete must allow reasonable space for others to make normal movements without making contact. Adequate space must be available before passing;

(iii) An athlete who approaches from any position to take advantage of the draft, bears responsibility for avoiding the draft;

(iv) To draft is to enter the bicycle or vehicle drafting zone:

Bicycle draft zone: the draft zone will be a rectangle. The width will always be 3 metres wide. The center of the leading 3-metre edge will be measured from the leading edge of the front wheel. The length of the rectangle will depend on the distance of the race: for Long distance events the length will measure 12 metres; for Standard distance events or shorter, the length will measure 10 metres.

An athlete may enter the draft zone of another athlete, but must be seen to be progressing through that zone. A maximum of 20 seconds will be allowed to pass through the zone of another athlete.

Vehicle draft zone will be a rectangle thirty-five (35) metres long by five (5) metres wide, which surrounds every vehicle on the bike segment. The front edge of the vehicle will define the center of the leading 5 metre edge of the rectangle.

(v) Entry into the bicycle drafting zone: An athlete may enter a bike draft zone in the following circumstances:

If the athlete enters the draft zone, and progresses through it within 20 seconds in the overtaking manoeuvre;

For safety reasons;

100 metres before and after an aid station or transition area;

At an acute turn;

If the Technical Delegate excludes a section of the course because of narrow lanes, construction, detours, or for other safety reasons.

(vi) Overtaking:

An athlete is passed when another athlete's front wheel is ahead of theirs;

Once overtaken, an athlete must move out of the draft zone of the leading athlete within 5 seconds.

Athletes must keep to the side of the course and not create a blocking incident. Blocking is where an athlete who is behind cannot pass due to the leading athlete being poorly placed on the course.